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What limits the redline on the F22A?

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    #1

    What limits the redline on the F22A?

    My dad got a big block Chevy v8 motor to put in... not sure yet, he's gonna have to get a car for it. Anyway, the motor is built extremely well, and it has a shift point of 7400 RPMs.

    This made me realize something. The F22A has a kinda low redline. It's something like 6300, less than the H23A, or the H22A, and less than a built v8, which really isn't fair. So I'm just wondering, why does the F22 have a low redline, and what does it take to up the redline? I know to up the redline that usually involves head work and an engine management system, but does the compression stroke or anything else limit our redline? Also, how high can people (realistically) raise the redline by doing certain things?
    Tags: None
    #2
    Redline is established by many reasons: the amount of air/fuel mix you can pump through the engine, the amount of electrical current available to ignite the mixture, the balance of the components and their stabilty at higher rpms among others. I'd have to say that the biggest limit on the f is going to be feeding it and getting rid of the exhaust fast enough. It takes a lot of air and fuel to fill those cylinders up at... 8000 rpms, for example, and if you can't feed it, you'll run into a condition where the a/f mix is very very bad and then bye-bye motor.

    I guarantee you that the redline on bisi's f22a isn't 6300.

    Comment

      #3
      cam and valve train mostly

      but compression helps out a lot
      crank and rods can handle
      Originally posted by deevergote
      Just do what PR CB7 said.

      "I'm Going For Wood" (Clickey Clickey)

      Comment

        #4
        If it's the ability to feed the engine and spit out the exhaust gas, wouldn't that mean that the H23 plenum and a full 2.5" exhaust and header would increase the redline? I'm not sure I've heard doing that can increase the redline on a car.

        I know the valve train helps a lot, but I just don't know how much that stuff helps. I highly doubt that getting Bisi's valves prings which are tested to 10,200 RPMs, for example, will up your redline to 10,200 RPMs. It'd just be nice to be able to out-rev a V8. Which shouldn't be hard, but apparently it is

        Comment

          #5
          Originally posted by Sarthos View Post
          If it's the ability to feed the engine and spit out the exhaust gas, wouldn't that mean that the H23 plenum and a full 2.5" exhaust and header would increase the redline? I'm not sure I've heard doing that can increase the redline on a car.

          I know the valve train helps a lot, but I just don't know how much that stuff helps. I highly doubt that getting Bisi's valves prings which are tested to 10,200 RPMs, for example, will up your redline to 10,200 RPMs. It'd just be nice to be able to out-rev a V8. Which shouldn't be hard, but apparently it is
          Yes, you should be able to go past the factory redline. I couldn't tell you how much. Once the engine starts to lose power, there's not any point in making it rev higher. So if it's still making decent power, it's still pretty safe to rev past the redline. That's just the safe mark for the stock engine. If you build a copletely fresh f22a, and give it all the nice goodies; stronger rods, pistons, bigger valves, bigger cam, ITBs, etc, it's not going to have a 6300 rpm redline. It'll be making power well above that point and you'll be able to drive it above the factory redline.

          Comment

            #6
            How high it makes power isn't a good way to guess the redline though, you can (in some cases) make power until the engine blows which isn't fun.

            Comment

              #7
              Originally posted by Sarthos View Post
              How high it makes power isn't a good way to guess the redline though, you can (in some cases) make power until the engine blows which isn't fun.
              If an engine is still making power at an RPM it can't physically handle, it wasn't a well thought out build...
              Originally posted by sweet91accord
              if aredy time i need to put something in cb7tuner. you guy need to me a smart ass about and bust on my spelling,gramar and shit like that in so sorry.

              Comment

                #8
                It also keeps the driver from taking it to such a high RPM that the valves begin to float. Upgrade the valvetrain parts, and lighten the rotating parts in the bottom end, and you'll be able to rev it pretty high, given you have it tuned.

                A stock F22 starts to lose power around 5800 RPM, anyways. At least mine did. (And it was an automatic. )

                Comment

                  #9
                  Originally posted by Sarthos View Post
                  If it's the ability to feed the engine and spit out the exhaust gas, wouldn't that mean that the H23 plenum and a full 2.5" exhaust and header would increase the redline? I'm not sure I've heard doing that can increase the redline on a car.

                  I know the valve train helps a lot, but I just don't know how much that stuff helps. I highly doubt that getting Bisi's valves prings which are tested to 10,200 RPMs, for example, will up your redline to 10,200 RPMs. It'd just be nice to be able to out-rev a V8. Which shouldn't be hard, but apparently it is
                  you are making sense, but are actually contradicting yourself at the same time

                  yes its the ability making the engine more capable of breathing also making the the engine exhaust too
                  just an bigger intake and exhaust wont do it
                  bigger lift and longer duration camshaft will make the the engine breath more air and for a longer time

                  springs will help out a lot too

                  in finalizing your paragraph you say it would be nice to out rev a v8

                  there is a shit load of v8's out there

                  from chevy to Ferrari an rpm range from 5k-8k come on son
                  Originally posted by deevergote
                  Just do what PR CB7 said.

                  "I'm Going For Wood" (Clickey Clickey)

                  Comment

                    #10
                    A manual tranny means it'll make power a little higher than auto doesn't it?

                    Comment

                      #11
                      transmission wont limit an engine's redline
                      Originally posted by deevergote
                      Just do what PR CB7 said.

                      "I'm Going For Wood" (Clickey Clickey)

                      Comment

                        #12
                        I know it won't up the redline (unless the tranny also has its own redline) I just mean that a manual makes better power at the high RPMs than an auto.

                        Comment

                          #13
                          Originally posted by PR CB7 View Post
                          transmission wont limit an engine's redline
                          it will on some cars. later.
                          Avoiding dirt at all costs

                          Comment

                            #14
                            I didn't want to speak on behalf of the manual cars, because I wasn't sure about them. I know how the automatic feels, though.

                            Comment

                              #15
                              This is an unusual thread.
                              I think the question has already been pretty well answered, but I'll reiterate.


                              We don't have a reason to rev higher, the engine doesn't make power past 5-6k rpm.

                              If you want to build the engine targeting a higher power band, then the red line should take care of itself. You're not going to get, or even find, components that make power from 8000-9000 rpm but can't survive above 6000 rpm.

                              And any component that only makes power up to 5000 rpm is going to be changed in the process of building the engine.

                              So the low red line is not really the main issue when dealing with the F. The problem is that the engine just doesn't make power at high rpm, or even near the red line for that matter.

                              Comment

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